It has been suggested that the Sudbury Basin could be compared with the Brent meteorite impact crater and that Sudbury may also have developed a relatively flat crater floor at a very early stage. More recent paleomagnetic interpretations appear to fit an original, subhorizontal, sill-like form for the Nickel Irruptive at Sudbury. These suggestions in turn permit formulation of a more satisfying model for the early stages of Sudbury basin evolution.

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